12656343040 has 96 divisors (see below), whose sum is σ = 33128812080. Its totient is φ = 4602265600.

The previous prime is 12656343019. The next prime is 12656343043. The reversal of 12656343040 is 4034365621.

It is a junction number, because it is equal to n+sod(n) for n = 12656342987 and 12656343005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12656343043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56460 + ... + 168820.

Almost surely, 2^12656343040 is an apocalyptic number.

12656343040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12656343040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16564406040).

12656343040 is an abundant number, since it is smaller than the sum of its proper divisors (20472469040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12656343040 is a wasteful number, since it uses less digits than its factorization.

12656343040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112399 (or 112379 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 34.

The spelling of 12656343040 in words is "twelve billion, six hundred fifty-six million, three hundred forty-three thousand, forty".